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reverse

Language/Type: C++ Map Set Vector collections
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Write a function named reverse that accepts as a parameter a reference to a map from integers to strings, and returns a map with the associations reversed. For example, if a variable named map stores the following key/value pairs: 

{1:"a", 2:"b", 3:"c"}

the call of reverse(map); would return the following map:

would yield 
{"a":1, "b":2, "c":3}

If there are duplicate values (k1, v) and (k2, v) in the original map, your returned map should contain the pair that would come earlier in sorted order.

Function: Write a C++ function as described, not a complete program.

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